GET UPDATES EVERYWHERE

BE THE FIRST TO BE UPDATED

JOIN OUR MAILING LIST NOW

By clicking subscribe I agree to the terms & conditions

ALL MOUNTAIN

Far out or nothing - with JEFFSY we have realized our very own definition of trail riding. JEFFSY is the YT among all mountain bikes, it's like your best friend for new top performances: together you climb the higher mountains, discover the most remote places and stamp downhill with full speed - JEFFSY and you, you are an unbeatable team

Choose Your Wheel Size

all-mountain
?
Wheels: 27 | 29
?
AL
?

Jeffsy Base

S

M

L

XL

XXL

2,299.00 €

incl. VAT plus excl. Shipping

The JEFFSY BASE delivers solid performance with impressive specs, a high quality aluminium frame, and the distinctive look of a YT. Its easy-to-adjust suspension and durable components make for long lasting good times.  

Send it over!
  • Material

    Alloy

  • Suspension

    160mm

Tech + Specs
  • Frame

  • Flip chip

  • Protection

  • Bearings

  • Chainsuck

  • Headtube

  • Internal Cable Routing

  • Virtual Four Link

Frame

Flip chip

Situated at the lower shock mount, the Flip Chip makes it quick and easy to adjust the geometry according to the terrain and riding style. The low position provides for a more aggressive headtube angle and a bigger BB drop, ideal for fast and rough tracks. In the high position, the headtube angle is 0.5 degrees steeper and the BB is higher. The higher BB gives more ground clearance and better performance on longer steep climbs.

Protection

Made from super-tough and wear-resistant PA 66, the downtube protector is bolted on and can be easily replaced. It is designed to wrap around the bottom bracket and thus provide extra protection for the side walls of the downtube from impacts and scratches. Additionally, the rubber chainstay and seatstay guards help prevent unwanted noise from the drivetrain.

Bearings

Extra seals protect the high-quality, double-sealed full complement bearings to keep water and dirt out and help prolong the service life.

Chainsuck

The inconspicuous chainsuck plates protect the frame from damage caused by a dropped chain. This keeps sensitive areas out of harm's way and helps prolong the frame's durability.

Headtube

The contact surfaces for the integrated headset are preformed directly in the carbon structure. The homogeneity of the material in this area creates the ideal balance of weight, durability and performance. The ZeroStack design with integrated bearings ensures a long service life.

Internal Cable Routing

For optimal protection, all cables are routed almost completely through the frame. Uninterrupted internal tubes provide for easy cable replacement and also help prevent unwanted noise. Small ridges ensure the cable plugs sit tight in the frame to seal the cable ports and a cable clamp holds them securely in place as they exit the frame under the rocker link.

Virtual Four Link

Our award-winning V4L suspension technology provides sensitivity off the top, with good mid-stroke support and plenty of end-stroke progressivity. The nice pop helps get the bike airborne whenever wanted, while the end-stroke progressivity makes sure the rear shock doesn't bottom out even on monster jumps. The high amount of anti-squat keeps the rear suspension neutral and improves pedal efficiency.

Flip chip

Flip chip

Situated at the lower shock mount, the Flip Chip makes it quick and easy to adjust the geometry according to the terrain and riding style. The low position provides for a more aggressive headtube angle and a bigger BB drop, ideal for fast and rough tracks. In the high position, the headtube angle is 0.5 degrees steeper and the BB is higher. The higher BB gives more ground clearance and better performance on longer steep climbs.

Protection

Protection

Made from super-tough and wear-resistant PA 66, the downtube protector is bolted on and can be easily replaced. It is designed to wrap around the bottom bracket and thus provide extra protection for the side walls of the downtube from impacts and scratches. Additionally, the rubber chainstay and seatstay guards help prevent unwanted noise from the drivetrain.

Bearings

Bearings

Extra seals protect the high-quality, double-sealed full complement bearings to keep water and dirt out and help prolong the service life.

Chainsuck

Chainsuck

The inconspicuous chainsuck plates protect the frame from damage caused by a dropped chain. This keeps sensitive areas out of harm's way and helps prolong the frame's durability.

Headtube

Headtube

The contact surfaces for the integrated headset are preformed directly in the carbon structure. The homogeneity of the material in this area creates the ideal balance of weight, durability and performance. The ZeroStack design with integrated bearings ensures a long service life.

Internal Cable Routing

Internal Cable Routing

For optimal protection, all cables are routed almost completely through the frame. Uninterrupted internal tubes provide for easy cable replacement and also help prevent unwanted noise. Small ridges ensure the cable plugs sit tight in the frame to seal the cable ports and a cable clamp holds them securely in place as they exit the frame under the rocker link.

Virtual Four Link

Virtual Four Link

Our award-winning V4L suspension technology provides sensitivity off the top, with good mid-stroke support and plenty of end-stroke progressivity. The nice pop helps get the bike airborne whenever wanted, while the end-stroke progressivity makes sure the rear shock doesn't bottom out even on monster jumps. The high amount of anti-squat keeps the rear suspension neutral and improves pedal efficiency.

Toptube
Reach
Stack
Seattube
Chainstay
Headtube Angle
Seattube Angle (eff)
Seattube Angle (act)
bb drop
wheelbase
headtube
bb height
fork installment length
fork offset

s

m

l

xl

xxl

Toptube
567 mm
590 mm
613 mm
636 mm
660 mm
Reach
422 mm
442 mm
462 mm
482 mm
502 mm
Stack
598 mm
608 mm
617 mm
626 mm
635 mm
Seattube
395 mm
415 mm
435 mm
460 mm
485 mm
Chainstay
432 mm
432 mm
432 mm
437 mm
437 mm
Headtube Angle
65,5° / 66°
65,5° / 66°
65,5° / 66°
65,5° / 66°
65,5° / 66°
Seattube Angle (eff)
76,5° / 77°
76,5° / 77°
76,5° / 77°
76,5° / 77°
76,5° / 77°
Seattube Angle (act)
70,5° / 71°
70,5° / 71°
70,5° / 71°
70,5° / 71°
70,5° / 71°
bb drop
13 / 6 mm
13 / 6 mm
13 / 6 mm
13 / 6 mm
13 / 6 mm
wheelbase
1167 mm
1191 mm
1215 mm
1244 mm
1268 mm
headtube
110 mm
120 mm
130 mm
140 mm
150 mm
bb height
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
fork installment length
550 mm
550 mm
550 mm
550 mm
550 mm
fork offset
44 mm
44 mm
44 mm
44 mm
44 mm
 

s

m

l

xl

xxl

Toptube
567 mm
590 mm
613 mm
636 mm
660 mm
Reach
422 mm
442 mm
462 mm
482 mm
502 mm
Stack
598 mm
608 mm
617 mm
626 mm
635 mm
Seattube
395 mm
415 mm
435 mm
460 mm
485 mm
Chainstay
432 mm
432 mm
432 mm
437 mm
437 mm
Headtube Angle
65,5° / 66°
65,5° / 66°
65,5° / 66°
65,5° / 66°
65,5° / 66°
Seattube Angle (eff)
76,5° / 77°
76,5° / 77°
76,5° / 77°
76,5° / 77°
76,5° / 77°
Seattube Angle (act)
70,5° / 71°
70,5° / 71°
70,5° / 71°
70,5° / 71°
70,5° / 71°
bb drop
13 / 6 mm
13 / 6 mm
13 / 6 mm
13 / 6 mm
13 / 6 mm
wheelbase
1167 mm
1191 mm
1215 mm
1244 mm
1268 mm
headtube
110 mm
120 mm
130 mm
140 mm
150 mm
bb height
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
344 / 352 mm
fork installment length
550 mm
550 mm
550 mm
550 mm
550 mm
fork offset
44 mm
44 mm
44 mm
44 mm
44 mm
sGeometry Sizefinder
S
154cm - 165cm | 5'0" - 5'4"
M
164cm - 175cm | 5'3" - 5'7"
L
174cm - 184cm | 5'7" - 6'0"
XL
183cm - 193cm | 6'0" - 6'3"
XXL
192cm - 202cm | 6'2" - 6'6"

This size table is only a suggestion. The optimal frame size depends also on your personal riding style.

Frame
Frame Size
Frame Size
 
S, M, L, XL, XXL
Color
Color
 
twotone blue,
black magic
Wheels
Wheels
DT Swiss M 1900 SPLINE
 
27,5“ x 30mm | 110x15mm | 148x12mm
Tires
Maxxis Minion DHR II
 
27,5“ x 2.4
Suspension
Fork
RockShox Yari RC
 
27,5“ | 160mm | 15QRx110 | 46mm Rake
adjustable Low-speed compression, rebound, air volumne, air pressure
Shock
RockShox Deluxe Select
 
230X65mm
adjustable compression, rebound, air volumne, air pressure
Drivetrain
Crankset
SRAM SX Eagle
 
175mm | 32T | DUB
Cassette
SRAM PG1210 Eagle
 
11-50T | 12-Speed
Rear derailleur
SRAM SX Eagle
 
12-Speed
Shift rear
SRAM SX Eagle
 
12-Speed
Components
Headset
Acros AZX-576
 
High Cap
Stem
Race Face AEFFECT R 35
 
50mm
Handlebar
Race Face AEFFECT R 35
 
20mm Rise | 780mm Width
Grips
ODI Elite Motion V2.1
 
Lock-On
Brakes
SRAM Guide T
 
Rotor CENTERLINE 200mm/180mm
Adjustable reach
Seatpost
YT Postman
 
31.6mm | 125mm/150mm/170mm Drop
Saddle
SDG FLY MNT
 
YT Custom
Weight
Weight
14,90 KG / 32,53 LB
 
Average weight for smallest size available, without tubes, pedals, and bottle.
Jeffsy

Jeffsy

PDF | 6.27 MB

Thirstmaster 4000

Thirstmaster 4000

PDF | 1.36 MB

Pro Race Pro Race 5,299.00 €* 27 29
Pro Pro 3,899.00 €* 27 29
Blaze Blaze 3,999.00 €* 29
Comp Comp 2,999.00 €* 27 29
Base Base 2,299.00 €* 27 29
Close
Carbon Icon

Our carbon frames deliver ideal stiffness and ultimate reliability at impressively low weight. Using a monocoque production technique, tube walls get extra thickness only where required, to resist the intense forces in critical areas. By using fibers of different strengths and optimizing the layup, we create stiff yet lightweight frames that withstand even the gnarliestof maneuvers.

Aluminium Icon

The AL model was developed specifically for lovers of high-quality aluminum bikes. The elaborately-designed frame sets new standards in aluminum workmanship: the multi-butted, hydroformed tubes don't only keep weight down and improve resilience, but embody the look of a true YT. High performance at an attractive price is the focus here.

Close